/* ============================================================
   学院官网 · Academic Design System
   五色层级：蓝 → 紫 → 绿 → 红 → 褐
   简约 · 庄重 · 学院派
   ============================================================ */
:root {
  /* ---- 五色主调 ---- */
  --blue:       #1A365D;   /* 第1层·蓝 — 导航栏/页脚/hero */
  --blue-hover: #0F2440;
  --blue-light: #EBF0F8;
  --blue-line:  #B0C4DE;

  --purple:     #553C9A;   /* 第2层·紫 — 系列标题 */
  --purple-bg:  #F3EFFC;
  --purple-line:#C9BDE6;

  --green:      #276749;   /* 第3层·绿 — 区块标题 */
  --green-bg:   #EDF7F1;
  --green-line: #A8D8B8;

  --red:        #9B2C2C;   /* 第4层·红 — 分类标题 */
  --red-bg:     #FDEDED;
  --red-line:   #E6B0B0;

  --brown:      #744210;   /* 第5层·褐 — 课程标题 */
  --brown-bg:   #F8F2EA;
  --brown-line: #D4C4B8;

  /* ---- 中性色 ---- */
  --white:      #FFFFFF;
  --bg:         #F5F5F0;   /* 页面底色 — 米白 */
  --card:       #FFFFFF;
  --text:       #1A202C;
  --text-mute:  #5A6577;
  --text-light: #A0AEC0;
  --border:     #E2E6EA;
  --shadow:     rgba(26, 54, 93, 0.08);

  /* ---- 字体 ---- */
  --serif:  "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans:   "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ============================================================
   导航栏 · 蓝
   ============================================================ */
.site-header {
  background: var(--blue);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(26, 54, 93, 0.15);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 3px;
  color: var(--white);
  white-space: nowrap;
}
.brand small {
  display: block;
  font-size: 10px;
  letter-spacing: 4px;
  color: rgba(255,255,255,0.6);
  font-weight: 400;
  margin-top: 1px;
}
.main-nav {
  display: flex;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.5px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: 4px;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.main-nav a:hover {
  background: rgba(255,255,255,0.10);
  color: #fff;
}

/* ============================================================
   页脚 · 蓝
   ============================================================ */
.site-footer {
  background: var(--blue);
  color: rgba(255,255,255,0.7);
  padding: 36px 0;
  margin-top: 80px;
  font-size: 13px;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer a:hover { color: #fff; }

/* ============================================================
   Hero 区域 · 蓝
   ============================================================ */
.hero {
  background: var(--blue);
  color: var(--white);
  padding: 60px 0 52px;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 36px;
  letter-spacing: 4px;
  margin: 0 0 10px;
}
.hero .lead {
  color: rgba(255,255,255,0.75);
  font-size: 15px;
  /*max-width: 640px;*/
  letter-spacing: 0.5px;
  line-height: 1.8;
  margin: 0;
}
.hero .breadcrumb {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  padding-bottom: 14px;
}
.hero .breadcrumb a { color: rgba(255,255,255,0.7); }
.hero .breadcrumb a:hover { color: #fff; }

/* Hero 变体 · 紫（系列页） */
.hero--series {
  background: linear-gradient(135deg, var(--blue) 0%, #2D1B69 100%);
  padding: 48px 0 44px;
}

/* ============================================================
   学位列表页
   ============================================================ */
.degree-list {
  padding: 52px 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.degree-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 5px solid var(--blue);
  display: flex;
  flex-direction: column;
  transition: box-shadow .25s;
}
.degree-card:hover {
  box-shadow: 0 6px 24px var(--shadow);
}
.degree-card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px 0;
}
.degree-num {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.degree-card-head h2 {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--purple);
  margin: 0;
  flex: 1;
}
.degree-count {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 1px;
  white-space: nowrap;
}
.degree-card-body {
  padding: 12px 28px 22px;
}
.degree-desc {
  font-size: 14px;
  color: var(--text-mute);
  margin: 0 0 14px;
  line-height: 1.8;
}
.degree-link {
  font-size: 13px;
  color: var(--blue);
  border-bottom: 1px solid var(--blue-line);
  letter-spacing: 1px;
  transition: color .2s;
}
.degree-link:hover { color: var(--purple); }

/* ============================================================
   系列详情页 · 五层层级
   ============================================================ */
.series-main {
  padding: 44px 0 60px;
}
.section-title {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 16px;
  padding-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title .bar {
  display: inline-block;
  width: 5px;
  height: 1.3em;
  border-radius: 3px;
  flex-shrink: 0;
}
.bar--green { background: var(--green); }
.bar--red   { background: var(--red); }

.section-block {
  margin-bottom: 52px;
}
.section-block:last-child {
  margin-bottom: 0;
}

/* ---------- 第3层·绿：简介与对象 ---------- */
.section-title--green {
  color: var(--green);
  border-bottom: 2px solid var(--green-line);
}
.intro-box {
  background: var(--green-bg);
  border-left: 3px solid var(--green);
  padding: 22px 26px;
}
.intro-box p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
}

/* ---------- 第3层·绿：课程与要求 ---------- */
.course-area {
  margin-top: 0;
}
.course-area .section-title--green {
  margin-bottom: 28px;
}

/* ---------- 第4层·红：分类 ---------- */
.category-group {
  margin-bottom: 36px;
}
.category-group:last-child {
  margin-bottom: 0;
}
.category-head {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--red);
  margin: 0 0 6px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--red-line);
  display: flex;
  align-items: center;
  gap: 10px;
}
.category-sub {
  font-size: 13px;
  color: var(--text-mute);
  margin: 0 0 18px 15px;
  line-height: 1.7;
}

/* ---------- 第5层·褐：课程 ---------- */
.course-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.course-card {
  display: flex;
  align-items: stretch;
  gap: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brown);
  padding: 22px 26px;
  transition: box-shadow .2s;
}
.course-card:hover {
  box-shadow: 0 4px 16px var(--shadow);
}
.course-cover {
  flex: 0 0 220px;
  width: 220px;
  height: auto;
  align-self: flex-start;
  display: block;
  border-radius: 4px;
  background-size: cover;
  background-position: center;
}
.course-cover--blank {
  height: 328px; /* 与 220px 宽下的 784:1168 竖版图片比例一致 */
  background: linear-gradient(135deg, var(--blue) 0%, #2D1B69 100%);
}
.course-body {
  flex: 1;
  min-width: 0;
}
.course-title {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--brown);
  margin: 0 0 14px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.course-code {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  color: var(--brown);
  background: var(--brown-bg);
  padding: 2px 10px;
  border-radius: 3px;
  letter-spacing: 1px;
}
.course-sub {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-mute);
}

/* 课程信息行 */
.course-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.meta-row {
  display: flex;
  gap: 12px;
  font-size: 14px;
  line-height: 1.7;
}
.meta-label {
  flex: 0 0 100px;
  font-weight: 500;
  color: var(--green);
  font-size: 13px;
  letter-spacing: 1px;
  flex-shrink: 0;
}
.meta-value {
  margin: 0;
  flex: 1;
  color: var(--text);
}
.meta-value .req-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.meta-value .req-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 3px;
}
.meta-value .req-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--red);
}

/* ============================================================
   师资卡片
   ============================================================ */
.teachers-page {
  padding: 48px 0 60px;
}
.teachers-intro {
  font-size: 14px;
  color: var(--text-mute);
  max-width: 720px;
  margin: -8px 0 36px;
  line-height: 1.8;
}
.teacher-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.teacher-card {
  background: var(--card);
  border: 1px solid var(--border);
  transition: box-shadow .25s;
  display: flex;
  flex-direction: row;
  gap: 20px;
  padding: 20px 24px;
}
.teacher-card:hover {
  box-shadow: 0 6px 24px var(--shadow);
}
.teacher-avatar-wrap {
  flex-shrink: 0;
  padding-top: 2px;
}
.teacher-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  background: #E8ECF4;
}
.teacher-avatar--empty {
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  width: 52px;
  height: 52px;
}
.teacher-avatar--empty svg {
  width: 24px;
  height: 24px;
  fill: rgba(255,255,255,0.7);
}
.teacher-info {
  flex: 1;
  min-width: 0;
}
.teacher-heading {
  margin-bottom: 10px;
}
.teacher-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 2px;
}
.teacher-title {
  font-size: 13px;
  color: var(--blue);
  letter-spacing: 1px;
  margin: 0;
}
.teacher-fields {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.teacher-field {
  display: flex;
  flex-direction: row;
  gap: 8px;
  font-size: 14px;
  line-height: 1.7;
}
.teacher-field-label {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-light);
  letter-spacing: 1px;
  width: 72px;
}
.teacher-field-value {
  margin: 0;
  color: var(--text);
}
.teacher-divider {
  height: 1px;
  background: var(--border);
  margin: 0 24px;
}

/* ============================================================
   首页 · 幻灯
   ============================================================ */
.slider {
  position: relative;
  width: 100%;
  height: 420px;
  overflow: hidden;
  background: var(--blue);
}
.slider-track {
  display: flex;
  height: 100%;
  transition: transform .6s ease;
}
.slider-slide {
  min-width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
}
.slider-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.slider-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,54,93,0.85) 0%, rgba(26,54,93,0.45) 100%);
}
.slider-body {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 0 28px;
  margin: 0 auto;
  width: 100%;
  color: #fff;
}
.slider-body h2 {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 3px;
  margin: 0 0 12px;
}
.slider-body p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255,255,255,0.8);
  margin: 0;
}
.slider-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}
.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  cursor: pointer;
  transition: background .3s;
}
.slider-dot.active {
  background: #fff;
}

/* ============================================================
   首页 · 内容区块
   ============================================================ */
.home-body {
  padding: 48px 0 20px;
}
.home-section {
  margin-bottom: 52px;
}
.home-more-link {
  color: var(--blue);
  border-bottom: 1px solid var(--blue-line);
  font-size: 14px;
  transition: color .2s;
}
.home-more-link:hover { color: var(--purple); }

/* ---- 学位入口 ---- */
.home-programs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.home-program-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  padding: 20px 22px;
  transition: box-shadow .25s;
}
.home-program-card:hover {
  box-shadow: 0 6px 20px var(--shadow);
}
.home-program-status {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 2px 10px;
  border-radius: 2px;
  margin-bottom: 10px;
}
.home-program-status.open {
  background: var(--green-bg);
  color: var(--green);
}
.home-program-status.building {
  background: #F0F0F0;
  color: var(--text-light);
}
.home-program-card h3 {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 6px;
}
.home-program-desc {
  font-size: 13px;
  color: var(--text-mute);
  margin: 0;
}

/* ---- 推荐课程 ---- */
.home-course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.home-course-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow .25s;
}
.home-course-card:hover {
  box-shadow: 0 6px 20px var(--shadow);
}
.home-course-cover {
  height: 160px;
  background-size: cover;
  background-position: center;
}
.home-course-cover--blank {
  background: linear-gradient(135deg, var(--blue) 0%, #2D1B69 100%);
}
.home-course-body {
  padding: 16px 20px 20px;
}
.home-course-no {
  font-size: 11px;
  color: var(--text-light);
  letter-spacing: 1px;
}
.home-course-body h3 {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin: 4px 0 4px;
}
.home-course-sub {
  font-size: 13px;
  color: var(--text-mute);
  margin: 0 0 8px;
}
.home-course-intro {
  font-size: 13px;
  color: var(--text-mute);
  line-height: 1.7;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- 最近动态 ---- */
.home-news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
}
.home-news-item {
  display: flex;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.home-news-thumb {
  width: 100px;
  height: 68px;
  border-radius: 4px;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
  background-color: #E8ECF4;
}
.home-news-date {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--text-light);
  font-family: var(--serif);
  width: 80px;
  padding-top: 2px;
}
.home-news-body {
  flex: 1;
}
.home-news-body h3 {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 6px;
}
.home-news-body p {
  font-size: 13px;
  color: var(--text-mute);
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   单页内容（t_page）
   ============================================================ */
.page-content {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 32px 36px;
  font-size: 15px;
  line-height: 2;
  color: var(--text);
}
.page-content p { margin: 0 0 16px; }
.page-content p:last-child { margin-bottom: 0; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 820px) {
  .site-header .container {
    height: auto;
    padding: 12px 20px;
    flex-direction: column;
    gap: 8px;
  }
  .main-nav {
    justify-content: center;
    gap: 4px;
  }
  .main-nav a {
    font-size: 12px;
    padding: 4px 10px;
  }
  .hero h1 { font-size: 28px; letter-spacing: 2px; }
  .slider { height: 300px; }
  .slider-body h2 { font-size: 24px; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .slider { height: 240px; }
  .slider-body h2 { font-size: 20px; }
  .slider-body p { font-size: 13px; }
  .slider-body { padding: 0 16px; }
  .home-body { padding: 32px 0 10px; }
  .degree-card-head { flex-wrap: wrap; gap: 10px; padding: 18px 18px 0; }
  .degree-card-body { padding: 10px 18px 18px; }
  .degree-card-head h2 { font-size: 17px; }
  .course-card { padding: 16px 18px; flex-direction: column; gap: 14px; }
  .course-cover { flex: none; width: 100%; height: auto; align-self: auto; }
  .course-cover--blank { height: 200px; }
  .course-title { font-size: 15px; }
  .meta-row { flex-direction: column; gap: 2px; margin-bottom: 12px; }
  .meta-label { flex: none; }
  .series-main { padding: 28px 0 40px; }
  .section-title { font-size: 20px; }
  .category-head { font-size: 16px; }
  .hero { padding: 40px 0 36px; }
  .hero h1 { font-size: 24px; }
  .teacher-grid { grid-template-columns: 1fr; }
  .teacher-heading { text-align: center; }
  .teacher-field { flex-direction: column; gap: 1px; }
  .teacher-field-label { width: auto; }
}